The "Obsoleted by" note is missing from the header, so by itself the RFC seems not to be obsolete.

--RATIONALE--
Generally, the text versions of RFCs do not include post-publication metadata (such as "Obsoleted by" or "Updated by") because this data was not available upon publication, and RFCs do not change after publication.

For this specific RFC, this information is available on all of them:
- RFC search result
- RFC info page (http://www.rfc-editor.org/info/rfc3041)
- RFC index

In addition there are HTML versions of RFCs available via tools.ietf.org; they are not maintained by the RFC Editor. They include an added header in a gray box, which shows post-publication metadata. In this case, the HTML version of RFC 3041 includes the data.